nodrift.patch

--- wsjtx/lib/wsprd/wsprd.c	2023-11-08 12:48:12.718133943 -0500
+++ wsjtx/lib/wsprd/wsprd.c	2023-11-08 11:35:17.917201270 -0500
@@ -35,6 +35,7 @@
 #include <stdint.h>
 #include <time.h>
 #include <fftw3.h>
+#include <stdbool.h>
 
 #include "fano.h"
 #include "jelinek.h"
@@ -725,6 +726,7 @@
     printf("       -v verbose mode (shows dupes)\n");
     printf("       -w wideband mode - decode signals within +/- 150 Hz of center\n");
     printf("       -z x (x is fano metric table bias, default is 0.45)\n");
+    printf("       -n no drift, does not attempt to follow a drifting frequency\n");
 }
 
 //***************************************************************************
@@ -813,11 +815,12 @@
 #include "./metric_tables.c"
     
     int mettab[2][256];
+    bool nodrift=false;
     
     idat=calloc(maxpts,sizeof(float));
     qdat=calloc(maxpts,sizeof(float));
     
-    while ( (c = getopt(argc, argv, "a:BcC:de:f:HJmo:qstwvz:")) !=-1 ) {
+    while ( (c = getopt(argc, argv, "a:BcC:de:f:HJmno:qstwvz:")) !=-1 ) {
         switch (c) {
             case 'a':
                 data_dir = optarg;
@@ -850,6 +853,9 @@
             case 'm':  //15-minute wspr mode
                 wspr_type = 15;
                 break;
+	    case 'n': // no drift
+		nodrift = true;
+		break;
             case 'o':  //use ordered-statistics-decoder
                 ndepth=(int) strtol(optarg,NULL,10);
                 break;
@@ -1006,6 +1012,9 @@
             maxdrift=0;    // no drift for smaller frequency estimator variance
             minsync2=0.10;
         }
+	if(nodrift) {
+	    maxdrift=0;
+	}
         ndecodes_pass=0;   // still needed?
         
         for (i=0; i<nffts; i++) {